CN118148405A - Text-protection building protection construction method for near-connected ultra-deep foundation pit - Google Patents
Text-protection building protection construction method for near-connected ultra-deep foundation pit Download PDFInfo
- Publication number
- CN118148405A CN118148405A CN202410318181.6A CN202410318181A CN118148405A CN 118148405 A CN118148405 A CN 118148405A CN 202410318181 A CN202410318181 A CN 202410318181A CN 118148405 A CN118148405 A CN 118148405A
- Authority
- CN
- China
- Prior art keywords
- pile
- text
- ultra
- raft
- foundation pit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 230000003068 static effect Effects 0.000 claims abstract description 27
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims description 22
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 230000002787 reinforcement Effects 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0222—Replacing or adding wall ties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Foundations (AREA)
Abstract
The invention relates to a text-protection building protection construction method for a near-connected ultra-deep foundation pit, and belongs to the technical field of foundation pit excavation. Before the construction of the ultra-deep foundation pit, the method is characterized in that the wall body of the text-protection building is reinforced firstly, then the strip-shaped foundation of the text-protection building is changed into a raft foundation, then anchor rod static pressure piles and emergency hole pressing piles are driven into the raft, and then a temporary steel frame structure with inner support and outer hoops is applied to the upper part of the wall body of the text-protection building, so that the ultra-deep foundation pit can be constructed. And removing the temporary steel frame structure after the ultra-deep foundation pit structure is closed. The method not only improves the bearing capacity and stability of the foundation of the text-protection building, but also effectively protects the text-protection building; and the construction of the ultra-deep foundation pit can be smoothly completed on the premise of not damaging the cultural relics, so that the construction quality and safety of the ultra-deep foundation pit are ensured, and the appearance and the historical value of the cultural relics are effectively protected.
Description
Technical Field
The invention relates to a text-preserving building protection construction method for a near-connected ultra-deep foundation pit, and belongs to the technical field of foundation pit excavation (E02D 17/0).
Background
With the continuous rapid development of cities, urban land resources are increasingly tense, development of underground space is a focus of attention, a large number of underground ultra-deep foundation pits are generated along with limited development of underground space, and the ultra-deep foundation pits also have the characteristics of close-proximity structures, narrow construction sites, complex surrounding environments and the like, so that higher requirements are put on support deformation of the close-proximity underground ultra-deep foundation pits and deformation of the surrounding structures. In particular to a text-preserving building which is close to an ultra-deep underground foundation pit, and because an immovable cultural relic exists in the text-preserving building, the text-preserving building needs to be reinforced and protected when the ultra-deep foundation pit is excavated. When the traditional excavation ultra-deep foundation pit encounters a text-protection building close to the ultra-deep foundation pit, the text-protection building is generally removed and rebuilt on a large scale, and the appearance and the historical value of the cultural relics can be destroyed.
Disclosure of Invention
The invention aims to solve the technical problems that: how to protect the text-protecting building while not affecting the ultra-deep foundation pit excavation of the immediately adjacent text-protecting building.
The technical scheme provided by the invention for solving the technical problems is as follows: a text-preserving building protection construction method for a near-connected ultra-deep foundation pit comprises the following steps:
S1: reinforcing the wall of the text-protected building
The wall body is permanently reinforced by adopting a reinforcing mesh and polymer mortar in combination and repair;
s2: changing strip foundation of text-preserving building into raft foundation
The method comprises the steps of firstly removing a half of the strip-shaped foundations, replacing the strip-shaped foundations with a half of the raft foundations, and then removing the other half of the strip-shaped foundations, and replacing the other half of the strip-shaped foundations with the other half of the raft foundations;
Removing a half of the strip-shaped foundation, cleaning soil and sundries at the removed position, ensuring the flatness of the foundation at the removed position, paving a reinforcing mesh on the foundation at the removed position, pouring concrete on the reinforcing mesh, and finally forming a whole raft foundation;
S3, driving anchor rod static pressure piles and emergency hole pressing piles on raft boards of which the raft foundation formed in the last step is positioned in the interior of the file and insurance building, wherein the depths of the anchor rod static pressure piles and the emergency hole pressing piles are slightly larger than the excavation depth of the ultra-deep foundation pit;
s4, applying a steel frame structure with an inner support and an outer hoop on the upper part of a wall body of the text-preserving building so as to temporarily strengthen the whole text-preserving building; the overall strength, rigidity and stability of the foundation pit are improved for the next foundation pit excavation;
s5, performing ultra-deep foundation pit construction, performing pile foundation construction, excavating soil of the ultra-deep foundation pit, and casting a structural bottom plate of the ultra-deep foundation pit;
And S6, removing the steel frame structure temporarily reinforced in the step S3 after the ultra-deep foundation pit structure is closed.
In the step S1, the reinforcing mesh is arranged at the wall body through lacing wires, and the inner wall adopts through-wall lacing wires; the top of the door and window is reinforced by the steel plate mesh matched with the steel bar mesh.
In the step S3, a plurality of groups of horizontal embedded square timber are additionally arranged on two sides of a wall body between a floor slab and an upper joist of the text-preserving building, and two adjacent groups of horizontal embedded square timber penetrate through the wall body through screws to be fixed; the adjacent horizontal embedded square timber is reinforced by the vertical embedded square timber; the joint of the wall and the wall is reinforced by an I-shaped steel frame.
Further, the step S4 is that before the raft is poured, the original soil body is firstly excavated manually, the soil body is excavated in a segmented and regional mode, C15 concrete is adopted as a cushion layer, and a macadam cushion layer with the thickness of 100mm is paved on the bottom surface of the C15 cushion layer; the thickness of the raft is 800mm, and the aperture of the reserved hole of the hole pressing pile is 435mm;
the newly-added anchor rod static pressure pile adopts 325mm, the outer diameter is 325mm, the wall thickness is 10mm, and the bearing capacity characteristic value of a single pile is 860.6kN;
the raft is poured by C30 concrete, and is cantilevered for 1m along the outer edges of the periphery of the wall body of the text-preserving building; driving an anchor rod static pressure pile and an emergency hole pressing pile; 57 anchor rod static pressure piles and 18 emergency hole pressure piles;
And after the construction of the anchor rod static pressure pile is completed, pouring concrete in the pile hole after the acceptance of pile length and verticality is completed, wherein the concrete is C20 fine stone concrete, and sealing the anchor rod static pressure pile after the pouring of the concrete is completed.
In the step S5, deformation and settlement of the civil engineering and security building can be monitored through the inclinometer and the level gauge.
The beneficial effects of the invention are as follows: the strip-shaped foundation of the text-protection building is reformed to form a whole board foundation, so that the bearing capacity and stability of the foundation are improved, and the text-protection building is effectively protected; because the reinforcing mesh polymer mortar is adopted for permanent reinforcement and the upper structure is temporarily reinforced, the influence of construction on the text-preserving building is reduced, and damage to cultural relics is avoided; the raft foundation and the pile foundation are adopted for construction, so that the construction efficiency is improved, the construction period is shortened, and the construction cost is reduced; by monitoring deformation of the construction process, the problems in construction are found and treated in time, and the construction quality and safety are ensured; meanwhile, the method does not influence the appearance of the cultural relics, and the appearance and the historical value of the cultural relics are effectively protected.
Drawings
The text-protection building protection construction method for the near-connected ultra-deep foundation pit is further described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of an exterior wall reinforcement;
FIG. 2 is a cross-sectional view of an interior wall reinforcement;
FIG. 3 is a cross-sectional view of reinforcement at the intersection of the longitudinal and transverse walls;
FIG. 4 is a cross-sectional view of door and window opening reinforcement;
FIG. 5 is a cross-sectional view of reinforcement at a corner of a longitudinal and transverse wall;
FIG. 6 is a schematic cross-sectional view of a text-protected building and its rafts, anchor static piles and emergency hole-pressing piles;
fig. 7 is a schematic cross-sectional view of a raft foundation;
Fig. 8 is a schematic view of a steel frame structure of an upper portion of a wall of a text-protected building.
Detailed Description
The text-protection building protection construction method for the near ultra-deep foundation pit is further described in detail below with reference to the accompanying drawings and the embodiment. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
Examples
In this embodiment, taking a certain scale segment of the stereoscopic tunnel engineering under the bridge of south Beijing Huimin as an example, the close-up text-preserving building is a commercial building located in the drum building area of south Beijing and reading Jiang Lou street, commercial port, street and community Longjiang roads No. 107-115. The building is built after 1930, is in a two-layer brick-wood structure towards the east, is a wooden stair, is originally a shop or hotel room, and is used as a commercial room, and is empty. The length of the whole building is about 30m, the width is about 10m, and the building area is 736 square meters. In a third national literature census, the building is considered an immovable cultural relic. After residents in the project land area are moved in 2013, the document and protection building is in a waste state, and all parts of the building are seriously damaged. The construction method for the ultra-deep foundation pit proximity text protection building protection comprises the following steps:
S1: reinforcing the wall of the text-protected building
As shown in fig. 1 to 5, the wall body is permanently reinforced by adopting a reinforcing mesh and polymer mortar, and is reinforced for outer walls, inner walls, junctions of longitudinal and transverse walls, corners of longitudinal and transverse walls and door and window openings:
The outer wall is shown in fig. 1, and the reinforcing mesh is arranged at the wall body through lacing wires; the inner wall adopts wall-penetrating lacing wires (tie wires), as shown in figure 2; the joint of the longitudinal wall and the transverse wall is shown in figure 3; the top of the door and window is reinforced by a steel plate net matched with a steel bar net, as shown in fig. 4; the corners of the longitudinal and transverse walls are shown in figure 5; quincuncial arrangement is adopted between the reinforcing mesh and the lacing wire.
S2: the strip foundation of the text-preserving building is changed into a raft foundation (also called a whole board foundation)
The method comprises the steps of firstly removing a half of the strip-shaped foundations, replacing the strip-shaped foundations with a half of the raft foundations, and then removing the other half of the strip-shaped foundations, and replacing the other half of the strip-shaped foundations with the other half of the raft foundations;
And after the half-width strip-shaped foundation is removed, firstly cleaning soil and sundries at the removed position, ensuring the smoothness of the foundation at the removed position, paving a reinforcing mesh on the foundation at the removed position, and then pouring concrete on the reinforcing mesh to finally form the whole raft foundation.
The method specifically comprises the following steps: before the raft is poured, the original soil body is manually excavated, the soil body is excavated in a segmented and regional mode, C15 concrete is adopted as a cushion layer, and a broken stone cushion layer with the thickness of 100mm is paved on the bottom surface of the C15 cushion layer; the raft board is poured by C30 concrete, and overhangs for 1m along the outer edges of the periphery of the wall body; the thickness of the raft is 800mm, reserved holes for the anchor rod static pressure piles and the emergency hole pressing piles are reserved on the raft, and the aperture is 435mm; the raft reinforcement adopts double-layer bidirectional reinforcement bars; a certain length of reinforcing steel bars is reserved before the foundation is reinforced, and the reinforcing steel bars are arranged in the same raft reinforcing steel bars; and (3) strictly forbidden to use a large machine for construction, a certain sequence is required to be followed when the soil is excavated, the whole soil is excavated one by one, the reasonable sectional and regional construction is also required to be carried out in the soil, after the soil is excavated, pouring is completed, and then the next soil is excavated.
S3, pre-reserved holes in the raft foundation formed in the last step are formed in the raft inside the file-keeping building, and anchor rod static pressure piles and emergency hole pressing piles are driven into the raft foundation, wherein the depth of the anchor rod static pressure piles and the depth of the emergency hole pressing piles are slightly larger than the excavation depth of the ultra-deep foundation pit, so that the file-keeping building is ensured not to be settled; as shown in fig. 6 and 7.
The emergency hole pressing pile adopts 18 steel pipes with the wall thickness of 5mm, and the heights of the steel pipes are equal to the heights of the rafts; welding the steel pipe and the raft steel bars; after the outer raft pouring and column sealing are completed, the appearance of the original pavement is restored; in the construction process, the later-stage pavement restoration and the use space of the original building are considered, the top standard height of the raft is reduced by 200mm (relative to the original ground elevation), and the thickness of the raft is unchanged.
The anchor rod static pressure pile adopts 57 steel pipes with the outer diameter of 325mm and the wall thickness of 10mm, and the bearing capacity characteristic value of a single pile is 860.6kN.
After the construction of the anchor rod static pressure pile is completed, pouring concrete in pile holes after the acceptance of pile length and verticality is completed, wherein the concrete is C20 fine stone concrete, and sealing the anchor rod static pressure pile after the pouring of the concrete is completed; when the static pressure pile of the anchor rod is pressed, the pile length is mainly controlled, the pile test is needed before formally pressing the pile, the number of the pile test is not less than 3, the bearing capacity of the static pressure pile of the anchor rod is detected after the pile test is finished, and the pile can be pressed in the next step after the pile is qualified according to the stipulation inspection; in the pile pressing process, the pile pressing frame is kept vertical, and nuts of anchor bolts are uniformly fastened; the pile section is kept vertical, so that the axes of the jack, the pile section and the pile pressing hole are overlapped, the deviation of the eccentric pressing pile position plane is not more than 20mm, and the deviation of the perpendicularity of the whole pile length is not more than L/100; the whole column should be continuously pressed to the designed elevation at one time, and pile pressing construction should be symmetrically performed; the pile tip should reach the depth of the designed bearing layer (strong weathered mudstone) for 0.5m duration not less than 5 minutes; when the anchor rod static pressure pile is welded, the steel pipe is required to be processed into a groove form before welding so as to be welded. When pile is pressed, a machine capable of automatically controlling the perpendicularity of the pile body is used. After the single pile is pressed, the pile length and verticality are checked, and the subsequent construction can be performed after the checking is qualified.
S4, applying a steel frame structure with an inner support and an outer hoop on the upper part of the wall body of the file-holding building, temporarily reinforcing the whole file-holding building, and improving the integral strength, rigidity and stability of the file-holding building for the next foundation pit excavation. The method specifically comprises the following steps: a plurality of groups of horizontal embedded square timber are additionally arranged on two sides of a wall body between a floor slab and an upper joist of the text-preserving building, and the two groups of horizontal embedded square timber penetrate through the wall body to be fixed through a screw rod; the plurality of horizontal embedded square timber are reinforced by vertical embedded square timber; the joint of the wall and the wall is reinforced by an I-shaped steel frame.
S5, performing ultra-deep foundation pit construction, firstly performing pile foundation construction, then excavating soil body of the ultra-deep foundation pit, and then casting a structural bottom plate of the ultra-deep foundation pit.
And S6, removing the steel frame structure temporarily reinforced in the step S3 after the ultra-deep foundation pit structure is closed.
In the ultra-deep foundation pit construction process in the step S5, deformation and settlement of the civil engineering and security building can be monitored through the inclinometer and the level gauge.
The foregoing description is only of the preferred embodiments of the invention, but the invention is not limited thereto, and all equivalents and modifications according to the concept of the invention and the technical solutions thereof are intended to be included in the scope of the invention.
Claims (7)
1. The text-preserving building protection construction method for the near-connected ultra-deep foundation pit is characterized by comprising the following steps of:
S1: reinforcing the wall of the text-protected building
The wall body is permanently reinforced by adopting a reinforcing mesh and polymer mortar in combination and repair;
s2: changing strip foundation of text-preserving building into raft foundation
The method comprises the steps of firstly removing a half of the strip-shaped foundations, replacing the strip-shaped foundations with a half of the raft foundations, and then removing the other half of the strip-shaped foundations, and replacing the other half of the strip-shaped foundations with the other half of the raft foundations;
Removing a half of the strip-shaped foundation, cleaning soil and sundries at the removed position, ensuring the flatness of the foundation at the removed position, paving a reinforcing mesh on the foundation at the removed position, pouring concrete on the reinforcing mesh, and finally forming a whole raft foundation;
S3, driving anchor rod static pressure piles and emergency hole pressing piles on raft boards of which the raft foundation formed in the last step is positioned in the interior of the file and insurance building, wherein the depths of the anchor rod static pressure piles and the emergency hole pressing piles are slightly larger than the excavation depth of the ultra-deep foundation pit;
S4, applying a steel frame structure with an inner support and an outer hoop on the upper part of a wall body of the text-preserving building so as to temporarily strengthen the whole text-preserving building;
s5, performing ultra-deep foundation pit construction, performing pile foundation construction, excavating soil of the ultra-deep foundation pit, and casting a structural bottom plate of the ultra-deep foundation pit;
And S6, removing the steel frame structure temporarily reinforced in the step S3 after the ultra-deep foundation pit structure is closed.
2. The text-preserving building protection construction method for the near-ultra-deep foundation pit, which is characterized by comprising the following steps of: in the step S1, the steel bar mesh is arranged at the wall body through lacing wires, and the inner wall adopts through-wall lacing wires; the top of the door and window is reinforced by the steel plate mesh matched with the steel bar mesh.
3. The text-preserving building protection construction method for the near-ultra-deep foundation pit, which is characterized by comprising the following steps of: in the step S2, before the raft is poured, the original soil body is firstly excavated manually, the soil body is excavated in a segmented and regional mode, C15 concrete is adopted as a cushion layer, and a macadam cushion layer with the thickness of 100mm is paved on the bottom surface of the C15 cushion layer; the raft board is poured by C30 concrete, and overhangs for 1m along the outer edges of the periphery of the wall body; the thickness of the raft is 800mm, reserved holes for the anchor rod static pressure piles and the emergency hole pressing piles are reserved on the raft, and the aperture is 435mm; the raft reinforcement adopts double-layer bidirectional reinforcement bars; a certain length of reinforcing steel bars is reserved before the foundation is reinforced, and the reinforcing steel bars are arranged in the same raft reinforcing steel bars; and (3) strictly forbidden to use a large machine for construction, a certain sequence is required to be followed when the soil is excavated, the whole soil is excavated one by one, the reasonable sectional and regional construction is also required to be carried out in the soil, after the soil is excavated, pouring is completed, and then the next soil is excavated.
4. The text-preserving building protection construction method for the near-ultra-deep foundation pit, which is characterized by comprising the following steps of: in the step S3, the emergency hole pressing pile adopts a steel pipe with the wall thickness of 5mm, and the height of the steel pipe is equal to the height of the raft; welding the steel pipe and the raft steel bars; after the outer raft pouring and column sealing are completed, the appearance of the original pavement is restored; the anchor rod static pressure pile adopts 57 steel pipes with the outer diameter of 325mm and the wall thickness of 10mm, and the bearing capacity characteristic value of a single pile is 860.6kN.
5. The text-preserving building protection construction method for the near-ultra-deep foundation pit, according to claim 4, is characterized in that: after the construction of the anchor rod static pressure pile is completed, pouring concrete in pile holes after the acceptance of pile length and verticality is completed, wherein the concrete is C20 fine stone concrete, and sealing the anchor rod static pressure pile after the pouring of the concrete is completed; when the static pressure pile of the anchor rod is pressed, the pile length is mainly controlled, the pile test is needed before formally pressing the pile, the number of the pile test is not less than 3, the bearing capacity of the static pressure pile of the anchor rod is detected after the pile test is finished, and the pile can be pressed in the next step after the pile is qualified according to the stipulation inspection; in the pile pressing process, the pile pressing frame is kept vertical, and nuts of anchor bolts are uniformly fastened; the pile section is kept vertical, so that the axes of the jack, the pile section and the pile pressing hole are overlapped, the deviation of the eccentric pressing pile position plane is not more than 20mm, and the deviation of the perpendicularity of the whole pile length is not more than L/100; the whole column should be continuously pressed to the designed elevation at one time, and pile pressing construction should be symmetrically performed; the pile tip should reach the depth of the designed bearing layer (strong weathered mudstone) for 0.5m duration not less than 5 minutes; when the anchor rod static pressure pile is welded, the steel pipe is required to be processed into a groove form before welding so as to be welded. When pile is pressed, a machine capable of automatically controlling the perpendicularity of the pile body is used. After the single pile is pressed, the pile length and verticality are checked, and the subsequent construction can be performed after the checking is qualified.
6. The text-preserving building protection construction method for the near-ultra-deep foundation pit, which is characterized by comprising the following steps of: in the step S4, a plurality of groups of horizontal embedded square timber are additionally arranged on two sides of a wall body between a floor slab and an upper joist of the text-preserving building, and the two groups of horizontal embedded square timber penetrate through the wall body through screws to be fixed; the plurality of horizontal embedded square timber are reinforced by vertical embedded square timber; the joint of the wall and the wall is reinforced by an I-shaped steel frame.
7. The text-preserving building protection construction method for the near-ultra-deep foundation pit, which is characterized by comprising the following steps of: in the step S5, deformation and settlement of the text and insurance building can be monitored through the inclinometer and the level gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410318181.6A CN118148405A (en) | 2024-03-20 | 2024-03-20 | Text-protection building protection construction method for near-connected ultra-deep foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410318181.6A CN118148405A (en) | 2024-03-20 | 2024-03-20 | Text-protection building protection construction method for near-connected ultra-deep foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118148405A true CN118148405A (en) | 2024-06-07 |
Family
ID=91286558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410318181.6A Pending CN118148405A (en) | 2024-03-20 | 2024-03-20 | Text-protection building protection construction method for near-connected ultra-deep foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118148405A (en) |
-
2024
- 2024-03-20 CN CN202410318181.6A patent/CN118148405A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108842819B (en) | Urban rail transit cable line tunnel construction method | |
| CN1958966A (en) | Underground consecutive sinking well type openweb wall body, and construction method | |
| CN211144503U (en) | High steep topography bridge tunnel meets section open cut tunnel and connects long structure | |
| CN110159294B (en) | Construction method for lengthening open cut tunnel at tunnel junction section of high and steep terrain bridge | |
| CN112575670B (en) | T-shaped rigid frame bridge suitable for tunnel to pass through giant karst cave and construction technology thereof | |
| Tan et al. | Practical solutions for concurrent excavation of neighboring mega basements closely surrounded by utility tunnels in Shanghai Hongqiao CBD | |
| CN104264684B (en) | A kind of prefabricated abnormity stake and construction method thereof on an empty stomach for deep foundation pit supporting structure | |
| CN105064711A (en) | Method for constructing underground garage between residential buildings | |
| CN114215090A (en) | Construction method of raft and compression pile in closed space | |
| CN110939139B (en) | Pile plate wall structure based on rigid contact of post-pile special-shaped retaining wall and construction method thereof | |
| CN204356780U (en) | A kind of prefabricated abnormity stake on an empty stomach for deep foundation pit supporting structure | |
| CN110886507B (en) | Method for increasing storey and expanding under existing building | |
| CN209941754U (en) | High-voltage power pipe culvert in-situ protection structure | |
| CN111827705A (en) | Method for expanding well barrel-shaped underground garage in existing underground garage | |
| CN104074370B (en) | A kind of building with brick-concrete structure entirety cross the river shift method and special support changing device thereof | |
| Trushko et al. | Construction of underground and multi-story car parks in high-density urban areas | |
| CN114319432B (en) | Construction process of semi-underground subway station and semi-underground subway station | |
| CN113338332B (en) | Reverse construction method for slightly weathered rock area | |
| CN118148405A (en) | Text-protection building protection construction method for near-connected ultra-deep foundation pit | |
| CN115897600A (en) | Construction method for newly-built foundation pit close to existing subway station deep foundation pit proximity area | |
| CN112627002B (en) | Continuous beam bridge suitable for tunnel to pass through giant karst cave and construction technical method thereof | |
| CN114837455B (en) | Method for reconstructing sunken hydraulic building | |
| Zargar et al. | Top-Down Construction Method: A Case Study of Commercial Building in Tehran | |
| CN217840090U (en) | Full-height inverted filter frame for pile-plate type retaining wall | |
| CN221297634U (en) | Structure of arched culvert for road |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |